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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Heater Systems >> Symptom Tests >> Test "E": Blower Motor Noise

Test "E": Blower Motor Noise

NOTE: Definition: Noise originating from the blower motor.
  1. Were you sent here from SYMPTOM DIAGNOSIS? If so, go to next step. If not, go to SYMPTOM DIAGNOSIS  under TROUBLE SHOOTING.
  2. Sit inside the vehicle. Close the vehicle doors and windows. Turn the ignition on, with the engine off. Cycle the blower motor through all of the speeds and modes in order to determine where and when the noise occurs. Is a noise evident during the blower operation? If so, go to next step. If not, go to step  10.
  3. Does the noise vary with the blower speed? If so, go to next step. If not, go to step  10.
  4. Inspect for excessive vibration at each blower motor speed by feeling the blower case. Is excess vibration present? If so, go to next step. If not, go to step  10.
  5. Remove the blower motor. See BLOWER MOTOR & FAN  under REMOVAL & INSTALLATION. Inspect the blower motor for deposits of foreign material. Did you find any foreign material on the blower motor? If so, go to step . 7. If not, go to next step.
  6. Inspect the blower motor for the following conditions:
    • Cracked Blades
    • A Loose Impeller Retainer
    • Improper Impeller Alignment
    Did you find any of these conditions? If so, go to step  8. If not, go to step  9.
  7. Remove the foreign material. After repairs, go to step  10.
  8. Replace the blower motor. See BLOWER MOTOR & FAN  under REMOVAL & INSTALLATION. After repairs, go to step  10.
  9. Install the blower motor. See BLOWER MOTOR & FAN  under REMOVAL & INSTALLATION. After repairs, go to step  10.
  10. Operate the system in order to verify the repair. Does the system operate correctly? If so, system is okay. If not, go to step  2.
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